Frank thompson



(No Model.)

F. THOMPSON.

DAMPER REGULATOR. N0..`298,635.

Patented May 13, 1884.

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llNITED dTATns PATENT OTT-Ten FRANK THOMPSON, OF NEV YORK, N. Y.

DAlVIPER-REGULATOR.

SPECIFICATION forming part of Letters Patent No. 298,635, dated May 13, 1884.

Application filed Jan1iary24,l84. (No model.)

To @ZZ whom it may concern Be it known that I, FRANK THOMPSON, a citizen of the United States, anda resident of New York, county and State of New York, have invented certain new and usefullmprove ments in Damper-Regulators, of which the following is a speciiication.

The improvements in damperregulators forming the subject-matter of this application for Letters Patent are shown in the accompanying drawings, in -which- Figure l is a front elevation. Fig. 2 is a longitudinal section. Fig. 3 is a side View, and Figs. 4:, 5, and 6 are enlarged views of the yoke-connection.

The class of damper-regulators to which my invention relates control the movement of the damper by the variation of the pressure in the boiler through the medium of a cylinder and piston,said piston being weighted,so as to move to close the damper when the boiler-pressure is at its maximum.

a is the cylinder; l), the piston; b, the pistonrod; c, the Weight, suspended by the rods CZ d to the yoke e, which is carried by the pistonrod b. The upper end of the piston-rod b is connected by the rope f to the segment g of the damper h, said rope passing over guidepulleyfj",

It is advantageous with this class of damperregulators to offer an increased resistance to the action of the boiler-pressure on the piston just` before the damper reaches its closing limit, and it is generally necessary to provide a stop to prevent the damper becoming jammed or fixed in the llue by being entirely closed. This stop has heretofore been made adjustable,and so is liable to derangeinent. To meet these ends I place a spiral spring, i, on the pistonrod b', resting freely on the top ofthe piston b, which spring is compressed between the cylinder'cap a and the piston, acting as a cushion to gradually retard the movement of the piston at the end of its stroke, and also acting as a stop by being fully compressed, as shown in the dotted lines in Figs. l and 2. When it is in this position, the connection to the damper h is made, so that the said damper is closed to cut off the draft as much as is desired. By this it will beseen that the damper can never j, clamped or secured to the become jammed in the flue, as the piston has reached the limit of its movement when the damper is closed.

Another improvement relates to the method of hanging the Weight c from the piston-rod b', which consists in fitting the yoke e loosely over the rod b, and supporting it on a collar,

rod. The bearing between the yoke e and collar j is made spherical, so that the yoke is free to rock on the collar, by which means the center of gravity of the weight c is always directly under the center of the piston b, even if there is a difference in the lengths of the suspendingrods d d; so I am enabled to form said rods with simple eyes on their ends to hook over the ends of the yoke e, and hooks cast in the weight c, whereas with the yoke e fixed rigidly on the rod b, as heretofore done, it hasl been necessary to provide the rods d d with turn-buckles orsimilar devices to permit ofthe weight c being adjusted under the pist-on, said adj ustment being then only approximately perfeet, as such weights are seldom of equal thick ness or density throughout, and consequently their centers of gravity are out of their center lines. The piston b, with such a weight, c, would bear against one side of the cylinder, causing undue resistance to its free action, which objectionable feature is entirely avoided by the spherical bearing of the yoke e.

To operate different dampers different lengths of the stroke of the piston b are required, and to allow for this adjustment of the stroke the collar j is adapted to be clamped on any part of thepiston-rod b by means of asetscrew.

The adjustment of the regulator in position and its operation are as follows: The cylinder a is secured in a Vertical position at such a height from the licor k that when the weight c'restson the iioor la the collar j rests on the cap a of the cylinder. The piston l) is then raised into its highest position, (the rod b being released'from the collar,) as shown by the dotted lines c', Fig. 2, and the connection made to the damper 7L, when placed in its closed position, as shown by the dotted lines 7i', Fig. 2. The piston b is now drawn down' until the damper h is moved into its open position, as

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shown at Fig. 2, and the collar j securely clamped to the piston-rod b. Everything is now in normal position, and remains so until the pressure in the boiler approaches the maximum, which forces the piston upward, lifting the determined Weight c with it, and When the maximum pressure is reached the spring i is compressed, acting as a cushion to stop the piston, which is thus always brought to rest against a fixed stop, and when the damper is iu position to out off the draft tothe limit required, as shown at Fig. l.

Vhen it is not desired to use the spherical bearing for the yoke, I propose to provide said yoke with set-screws, so thatit can be securely fastened in any position on the piston rod, and thus avoid the necessity of using the collar j.

v/Vhat I claim, and desire to secure by Letters Patent, isl 1. In a damperlregulator, in combination, the weight c, the rods d d, the yoke e, the cylinder a, the piston b, the piston-rod b', fitted loosely through the yoke e, the adjustable co1- lar j, 'clamped on the piston-rod b, and supporting the yoke e and l Weight e, and the damper h,eonneeted to the free ends of the piston-rod, thus providing means for adjusting the piston in the Cylinder `after the apparatus is in position, substantially as and for the purpose set forth.

2. In a damper-regulator, the vertically-arranged eylinder a and piston b, in combination with the weighted yoke e, supported by means of a spherical bearing ou the collar j, secured to the piston-rod b, substantially as Set forth.

3. In combination, the cylinder a, piston b, spring i, piston-rod b', eollarj, yoke e, rods cl d, and Weight e, substantially as and for the purpose hereinbefore set forth.

In testimony whereof I have hereunto set my hand, at New York, county and State of New York, this 22d day of January, A. D. 1884..

FRANK THOMPSON. Vitnesses:

H. D.'W1LLIAMs,` ALFRED SHEDLOOK. 

